Who says volatility is all bad? The fearfully stumbling stock market means that some excellent stocks are trading at or near fire sale prices. For investors with the patience to wait for the right moment, here are eight companies to keep an eye on -- or to snap up right now.

Standard & Poor's downgraded the U.S. debt rating for the first time on Friday. Coming on top of concerns of a second recession, the move has investors worried that we're headed into a bear market for stocks. Here's what a bear market would mean.

The S&P 500 was up by only 4% in the first half of 2011, and it fell about 1% in the second quarter. Will it end there? A sell-off may be about to begin that would take the index lower for the full year. Here are half a dozen reasons why one of history's most impressive stock market runs may have ended.